[PATCH 3.5 56/64] sctp: Perform software checksum if packet has to be fragmented.

From: Luis Henriques
Date: Mon Oct 28 2013 - 10:52:35 EST -stable review patch. If anyone has any objections, please let me know.


From: Vlad Yasevich <vyasevich@xxxxxxxxx>

commit d2dbbba77e95dff4b4f901fee236fef6d9552072 upstream.

IP/IPv6 fragmentation knows how to compute only TCP/UDP checksum.
This causes problems if SCTP packets has to be fragmented and
ipsummed has been set to PARTIAL due to checksum offload support.
This condition can happen when retransmitting after MTU discover,
or when INIT or other control chunks are larger then MTU.
Check for the rare fragmentation condition in SCTP and use software
checksum calculation in this case.

CC: Fan Du <fan.du@xxxxxxxxxxxxx>
Signed-off-by: Vlad Yasevich <vyasevich@xxxxxxxxx>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
net/sctp/output.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sctp/output.c b/net/sctp/output.c
index a80b310..a1e2a9b 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -524,7 +524,7 @@ int sctp_packet_transmit(struct sctp_packet *packet)
if (!sctp_checksum_disable) {
if (!(dst->dev->features & NETIF_F_SCTP_CSUM) ||
- (dst_xfrm(dst) != NULL)) {
+ (dst_xfrm(dst) != NULL) || packet->ipfragok) {
__u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);

/* 3) Put the resultant value into the checksum field in the

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/